Quintana-Nedelcos, A., Leong, Z. and Morley, N.A. orcid.org/0000-0002-7284-7978 (2021) Study of dual-phase functionalisation of NiCoFeCr-Alx multicomponent alloys for the enhancement of magnetic properties and magneto-caloric effect. Materials Today Energy, 20. 100621. ISSN 2468-6069
Abstract
We have studied the effect of phase separation on the magnetic and magneto-caloric properties of the CoFeNi0.5Cr0.5-Alx (x= 0.0, 1.0 and, 1.5) system. Results show that a collaborative behaviour amongst FeCr-rich segregated nanoparticles (NPs) increases the saturation magnetisation (Ms) whilst the Curie temperature (Tc) is controlled by the amount of added Al. With a strong ferromagnetic coupling between segregated FeCr-NPs, the CoFeNi0.5Cr0.5-Al1.0 sample shows the highest Ms (100 Am2kg-1) with an increase of 61% over the Al-free CoFeNi0.5Cr0.5 sample. It is argued that as the ferromagnetic interaction increases in a degenerated super-spin-glass like state of the NPs the field induced phase transition is broadened whilst the magnetic entropy decreases. In turn, the CoFeNi0.5Cr0.5-Al1.0 sample shows the highest refrigerant capacity (17.1 Jkg-1 at μ0ΔH = 1.0 T), and the smallest measured magnetic entropy change (ΔSmpeak = 0.22 Jkg-1K-1). We found that the enhanced magnetic and refrigerant capacity by mean of phase separation and NPs clustering are amongst the highest reported for the multi-component alloys being investigated for energy applications in the high temperature range.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Elsevier Ltd. This is an author produced version of a paper subsequently published in Materials Today Energy. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Magnetic properties; High Entropy Alloys; Multicomponent Alloys; Phase Segregation; Nano-Particles; Inter-particle Interaction; Magneto-caloric effect |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number ROYAL SOCIETY SRF\R1\180020 LEVERHULME TRUST (THE) RPG-2018-324 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 11 Jan 2021 11:40 |
Last Modified: | 09 Feb 2022 16:31 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.mtener.2020.100621 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:169922 |